1975-01-17
1977-09-20
Gilliam, Paul R.
E21D 1702
Patent
active
040488039
ABSTRACT:
The invention concerns an advanceable shield support assembly for longwall mining. The assembly has a pivotable main roof cap housing a retractable and extensible auxiliary roof cap. Normally the main roof cap supports the roof and the auxiliary one is retracted. However, before the assembly is advanced, the auxiliary roof cap is extended to support the roof section between the working face and the front edge of the main roof cap. The movement of the auxiliary roof cap, and the force with which it engages the roof section, are controlled by cooperating guide tracks and track-engaging elements capable of exerting a wedging action.
REFERENCES:
patent: 3216202 (1965-11-01), Seddon
patent: 3240021 (1966-03-01), Meriaux et al.
Aufsatz Istvan
Bohnert Jozsef
Bole Karoly
Branyi Laszlo
Ilyes Zoltan
Banyaszati Kutato Intezet
Corbin David H.
Gilliam Paul R.
LandOfFree
Mining shield support apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mining shield support apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mining shield support apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-664555